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rotation, and restricted grazing during wet periods help to keepthe as protect the soil from compaction. pasture ure in good condition and If this unit is used for homesite development, the main limitation is depth to the hardpan. The rare flooding is a hazard. Ripping the hardpan improves permeability and thus also improves the suitability of the soil for septic tank absorption fields, Houses, roads, and streets should be constructed above expected flood levels. I This map unit is in capability units Ills-8 (MLRA-17), irrigated, and IVs-8 (MLRA-17), nonirrigated. It is in vegetative soil group G. 250-Stockton clay, 0 to 2 percent slopes. This somewhat poorly drained, nearly level soil is in basins It is deep to a hardpan. It formed in alluvium derived from mixed rock sources. Mottles in the profile indicate a somewhat poorly drained soil; however, drainage has been improved by levees and reclamationro e p � cts A few areas are dissected by intermittent sloughs that have been filled as a result of land leveling. P`f Elevation is sea level-to 100 feet. The average annual precipitation is about 14 inches, the average annual air temperature is about 60 degrees F, and the average frost-free period is about 270 days. Typically, the surface layer is dark gray clay about 29 inches thick. The upper pp r 8 inches of the subsoil also is dark gray clay. The next 5 inches is light brownish gray; and grayish brown clay I¢ loam. The lower part to a depth of 60 inches is a variegated dark grayish brown and dark brown, weakly cemented to strongly cemented hardpan. In some areas the surface layer is silty clay, silty clay loam, or clay loam. Included in this unit are small,areas of Archerdale and Vignolo soils on the slightly higher parts of the landscape; Galt and Jacktone soils in landscape positions similar to those of the Stockton soil; 11 and Egbert, Guard, and Rioblancho soils in the slightly lower positions Also included are small areas of Stockton soils that are highly calcareous or saline-sodic throughout Included areas make up about 15 percent of the total acreage. Permeability is slow in the Stockton soil. Available water capacity is moderate. The shrink-swell potential is high.. The effective rooting depth is limited by the hardpan at a depth of 40 to 60 inches. Depth to the water table is more than 5 feet, but water may be briefly perched above the hardpan after periods of heavy rainfall or irrigation- Runoff is slow, and the hazard of water erosion is slight. The rate of water intake in Irrigated areas is 0.1 inch per hour. The soil is subject to rare flooding, which occurs during years of abnormally high precipitation. Most areas are used for irrigated crops or orchards. A few areas are used as irrigated pasture or for urban development. This unit may provide wetland functions and values. These should be considered in plans for enhancement of wildlife habitat or land use conversion. This unit is suited to irrigated row, field, and orchard crops. The main limitations are the slow permeability and depth to the hardpan. Because of the restricted permeability, water applications should be regulated so that the water does not stand on the surface and damage the crops. The hardpan limits the suitability for Refer to page 22 for.Endnotes and Reference Sources . Western Dairy Design Associates,Inc.2003 Page 8 w I